What is new today is that the Kindle DX, its new larger reader, has also been added to the mix of downloadable code. And you can also download the code to all the previous firmware version of both the first and second generation Kindles.

In big bold letters, Amazon includes the agreement you enter into by downloading the source code:

AMAZON AND ITS AFFILIATES PROVIDE THE SOURCE CODE TO YOU ON AN “AS IS” BASIS WITHOUT REPRESENTATIONS OR WARRANTIES OF ANY KIND. YOU EXPRESSLY AGREE THAT YOUR USE OF THE SOURCE CODE IS AT YOUR SOLE RISK. TO THE FULL EXTENT PERMISSIBLE BY APPLICABLE LAW, AMAZON AND ITS AFFILIATES DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. AMAZON AND ITS AFFILIATES WILL NOT BE LIABLE FOR ANY DAMAGES OF ANY KIND ARISING FROM THE USE OF THE SOURCE CODE, INCLUDING, BUT NOT LIMITED TO DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, AND CONSEQUENTIAL DAMAGES.

But if that doesn’t scare you away, go for it. I’m not really sure what anyone has done or is doing with it, but it’s cool that Amazon has opened it up.

Update: Here’s a bit more about this from a technical perspective from commenter Rod Begbie:

This isn’t the source to the Kindle application. It’s just the GPL libraries used to power the Kindle software, along with the patches made by Amazon to those libraries.

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OverviewAmazon is an e-commerce retailer formed originally to provide consumers with products in two segments. It offers users with merchandise and content purchased for resale from vendors and those offered by third-party sellers.
Operating in North American and International markets, Amazon provides its services through websites such as amazon.com and amazon.ca. It also enables authors, musicians, filmmakers, …